Removable valve-seat



D. T. GRAY.

REMOVABLE VALVE SEAT.

APPLICATION FILED JUNE I5, 1920.

1,376,427, Patented May 3, 1921.

J V M /J 4 l6 UNITED stares DANIEL '1, GRAY, OF LOUISVILLE, KENTUCKY.

REMOVABLE VALVE-SEAT.

Specification of Letters Patent.

Patented May 3, 1921.

Application filed June 15, 1920. Serial No. 389,119.

To all whom it may concern Be it known that I, DANIEL T. GRAY, a citizen of the United States, residing at Louisville, in the county of Jefferson and State of Kentucky, have invented a new and useful Removable Valve-Seat, of which the following is a specification.

This invention relates to removable valve seats and has for its object the provision of a valve seat that is economical in manufacture and installation and that may be removed and replaced by an unskilled mechanic.

With these and other objects in view, alppearin as the description proceeds, t e invention resides in the novel comblnation and arrangement of parts hereinafter pointed out and claimed, it being understood that slight changes may be .made within the scope of what is claimed w1thout departing from the spirit or saorificlng any of the advantages of the inventlon.

In the drawlng forming a part of this specification and in which similar reference characters designate corresponding parts throughout the several figures:

Figure 1 is a plan v ew of the device;

Fig. 2 is a section on line 2-2 of F1 1;

Fig. 3 is a detail view of a part 0 the device; and V I Fig. 4 is a similar vlew looking at right angles to the showing of Fig. 3.

Removable valve seats as heretofore produced are of two kinds, namely threadedly connected seats and driven seats. In the former, the valve seats readily removable in case reseating is necessary, but more machine work is required in the manufacture of the valve both on the device to which the valve seat is fitted and on the valve seat itself than is required on adriven seat.

In the driven seat less machine work is required at the time of manufacture but when driven into place it must be calked or upset on the under side of the valve plate to retain it in place, with the result that its removal is an expensive operation.

The present invention aims to eliminate the objectionable features as hereinbefore pointed out and to this end a r1ng'5 15 provided, having its outer surface slightly tapered as indicated at 6, which is adapted to seat in a tapered opening 7 in the valve plate, indicated at 8. The ring 5 is counterbored as shown at 9, said counterbore belng plate.

threaded at 10. A valve seat spider 11 is exteriorly threaded and is adapted to be seated 1n the counterbore 9, the valve seat 12 extendmg above the ring 5. A plurality of retaining members or keys 13 being provided for securing the ring 5 to the valve The members 13 each comprise a body portlon 14 having upper and lower lugs 15 pro ect 1ng therefrom which en age the correspondlng faces of the valve p ate. The body 14 1s also provided at its lower end wlth a lug 16 Whlch is adapted to support the ring 5.

Slots 17 are formed in the periphery of the rlng 5 to receive the body portion 14 of the members 13, and are proportioned so as to cut away the counterbored portion of the rlng, so that the keys 13 are exposed 'wlthm the counterbore, the keys bein threaded on this exposed portion as indicated at 18 to correspond with the threaded counterbore. In assembling the valve seat, and supportng r1ng the keys 13 are placed in the openmg 7 with the lugs 15 engaging the upper and lower faces of the valve plate, the rm 5 is the r lowered into the opening 7 the keys 13 enterin the slots 17, several light blows are then ehvered on the top of the ring 5 to seat the same in the bore 7 and prevent its rotating when the valve seat is screwed in.

It will be apparent that a valve seat constructed in accordance with this invention possesses the advantages of both the driven seat and the threaded seat, since it is unnecessary to thread the valve plate to secure the valve seat in place, thus eliminating the ossibility of ruining the threads in the Va ve plate as may occur in removing a threaded valve seat, thus rendering the plate useless for a standard size valve seat and necessitating rethreading the plate and making an oversize valve seat. It also has theadvantage of a screwed in valve seat, since the member 11 can be readily removed for reseating the face 12 and as readily returned and screwed tightly into place. It will here be noted that the threads on parts 9 and 11 are slightly tapered so that when screwed in place it will remain secure in operation.

After the face 12 has been reseated so many times that it' is no longer useful the only replacement required is the member 11.

Having thus described the invention what is claimed is:

1. In a device of the class described, an annular member adapted to be seated in a valve plate, a valve seat secured to the annular member and means cooperating with the valve plate, the annular member and valve seat for securing the annular member to the valve plate.

2. In a device of the class described an annular member adapted to be seated in a, valve plate, a valve seat secured to the annular member and means cooperating with the valve plate, annularmember and the valve seat for securing the said parts together.

3. The combination with a valve plate having. a tapered opening, of an annular member adapted to be seated in said opening, the annular member having a slot in the periphery thereof, a key adapted to be seated in the slot, and a valve seat thread edly connected to the annular member and the key, the key cooperating with the valve DANIEL 'r. GRAY.

Witnesses:

M. J. MALoNnY, Sr., JOHN F. Veer. 

